This replacement thermostat for an old refrigerator offers LCD display showing temperature in C or F, 0.5C accuracy and allows target temperature to be set percisely. Uses ATmega8 controller and DS18B20 1-wire sensor.
Made by bending a coat hanger, this antenna is for 70cm and can be scaled for UHF CB. It works well, especially considering how quick and easy it is to make.
An interactive map showing Australian amateur radio repeaters. Navigate as required and click on a repeater-site icon to display frequency, ctcss and other details and notes. Display all repeaters or select by band.
The concepts behind direct digital synthesis (DDS) can be explained without the need for complex maths nor heavy-duty digital electronics theory. This tutorial describes how DDS works in simple and easy to understand terms.
A minimalist DIY programming and development board for the ATtiny2313 AVR microcontroller. Made on a piece of matrix board using point-to-point wiring.
A half-wave end-fed for 2m is built from PVC pipe and a couple of meters of RG58 coax. This easily reproducible design from VK2ZOI can be made quickly and performs well. The addition of some tinfoil and sticky tape turns this into a dual-band 70cm collinear.
A self contained programming adapter for PRM80 series radios that is built into a DB9 to RJ45 convertor using a miniature MAX3232 module for level convertion. Power is obtained from the radio via the programming cable.
A DIY build of VK2BTL's sensitive field strength meter circuit design, using parts from an old CB SWR meter. Ideal for testing antenna, radio control and handheld transmitters.